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Date:   Wed, 1 Jul 2020 12:55:36 -0700
From:   Andrii Nakryiko <>
To:     Martin KaFai Lau <>
Cc:     bpf <>, Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Kernel Team <>,
        Networking <>
Subject: Re: [PATCH bpf-next 2/2] bpf: selftests: Restore netns after each test

On Wed, Jul 1, 2020 at 12:48 PM Martin KaFai Lau <> wrote:
> It is common for networking tests creating its netns and making its own
> setting under this new netns (e.g. changing tcp sysctl).  If the test
> forgot to restore to the original netns, it would affect the
> result of other tests.
> This patch saves the original netns at the beginning and then restores it
> after every test.  Since the restore "setns()" is not expensive, it does it
> on all tests without tracking if a test has created a new netns or not.
> The new restore_netns() could also be done in test__end_subtest() such
> that each subtest will get an automatic netns reset.  However,
> the individual test would lose flexibility to have total control
> on netns for its own subtests.  In some cases, forcing a test to do
> unnecessary netns re-configure for each subtest is time consuming.
> e.g. In my vm, forcing netns re-configure on each subtest in sk_assign.c
> increased the runtime from 1s to 8s.  On top of that,  test_progs.c
> is also doing per-test (instead of per-subtest) cleanup for cgroup.
> Thus, this patch also does per-test restore_netns().  The only existing
> per-subtest cleanup is reset_affinity() and no test is depending on this.
> Thus, it is removed from test__end_subtest() to give a consistent
> expectation to the individual tests.  test_progs.c only ensures
> any affinity/netns/cgroup change made by an earlier test does not
> affect the following tests.
> Signed-off-by: Martin KaFai Lau <>
> ---

LGTM, thanks.

Acked-by: Andrii Nakryiko <>

>  tools/testing/selftests/bpf/test_progs.c | 23 +++++++++++++++++++++--
>  tools/testing/selftests/bpf/test_progs.h |  2 ++
>  2 files changed, 23 insertions(+), 2 deletions(-)


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